/*
 * Copyright 2007, Lloyd Hilaiel.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 * 
 *  3. Neither the name of Lloyd Hilaiel nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */ 

#include <yajl/yajl_parse.h>
#include <yajl/yajl_gen.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int reformat_null(void * ctx)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_null(g);
    return 1;
}

int reformat_boolean(void * ctx, int boolVal)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_bool(g, boolVal);
    return 1;
}

int reformat_integer(void * ctx, long long integerVal)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_integer(g, integerVal);
    return 1;
}

int reformat_double(void * ctx, double doubleVal)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_double(g, doubleVal);
    return 1;
}

int reformat_string(void * ctx, const unsigned char * stringVal,
                     unsigned int stringLen)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_string(g, stringVal, stringLen);
    return 1;
}

int reformat_map_key(void * ctx, const unsigned char * stringVal,
                   unsigned int stringLen)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_string(g, stringVal, stringLen);
    return 1;
}

int reformat_start_map(void * ctx)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_map_open(g);
    return 1;
}


int reformat_end_map(void * ctx)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_map_close(g);
    return 1;
}

int reformat_start_array(void * ctx)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_array_open(g);
    return 1;
}

int reformat_end_array(void * ctx)
{
    yajl_gen g = (yajl_gen) ctx;
    yajl_gen_array_close(g);
    return 1;
}

static yajl_callbacks callbacks = {
    reformat_null,
    reformat_boolean,
    reformat_integer,
    reformat_double,
    reformat_string,
    reformat_start_map,
    reformat_map_key,
    reformat_end_map,
    reformat_start_array,
    reformat_end_array
};

static void
usage(const char * progname)
{
    fprintf(stderr, "usage:  %s <filename>\n"
                    "    -m minimize json rather than beautify (default)\n",
            progname);
    exit(1);

}

int 
main(int argc, char ** argv)
{
    yajl_handle hand;
    static unsigned char fileData[8192];
    /* generator config */
    yajl_gen_config conf = { 1, "  " };
	yajl_gen g;
    yajl_status stat;
    size_t rd;

    /* check arguments.  We expect exactly one! */
    if (argc == 2) {
        if (!strcmp("-m", argv[1])) {
            conf.beautify = 0;
        } else {
            usage(argv[0]);
        }
    } else if (argc != 1) {
        usage(argv[0]);
    }
    
    g = yajl_gen_alloc(&conf);

    /* ok.  open file.  let's read and parse */
    hand = yajl_alloc(&callbacks, (void *) g);
        
    rd = fread((void *) fileData, 1, sizeof(fileData) - 1, stdin);
        
    if (rd < 0) {
        exit(1);
    } else if (rd == 0) {
        fprintf(stderr, "read EOF\n");
    } else {

        fileData[rd] = 0;

        /* read file data, pass to parser */
        stat = yajl_parse(hand, fileData, rd);
        if (stat != yajl_status_ok) {
            unsigned char * str = yajl_get_error(hand, 1, fileData, rd);
            fprintf(stderr, (const char *) str);
            yajl_free_error(str);
        } else {
            const unsigned char * buf;
            unsigned int len;
            yajl_gen_get_buf(g, &buf, &len);
            printf((const char *) buf);
        }
    }
    yajl_gen_free(g);
    yajl_free(hand);

    return 0;
}
